下印度河盆地K油田白垩系开阔海岸相沿岸砂坝沉积特征

发布时间：2018-01-05 18:09

本文关键词：下印度河盆地K油田白垩系开阔海岸相沿岸砂坝沉积特征　出处：《地质科技情报》2017年01期 　论文类型：期刊论文

【摘要】：根据岩心、测井、地震及区域地质背景资料,综合矿物岩石学、沉积构造、测井相及地震相等各类相标志,巴基斯坦下印度河盆地K油田白垩系上砂岩组为典型的开阔海岸相的沿岸砂坝沉积,其相标志包括:储层以高成熟度的石英砂岩为主,含有海绿石、鲕海绿石等海相指示矿物,呈分散状分布;发育平行-低角度交错层理或块状层理及潮汐层理类型,岩心中见丰富的生物介壳,具有大量的生物潜穴和强烈的生物扰动现象;测井相多呈漏斗型或箱型,以反旋回为主;地震相以平行-亚平行席状为主;陆棚风暴沉积与之伴生。分析认为,沿岸砂坝平面上多呈条带状平行于海岸线分布,纵向上多期沿岸砂坝叠置,砂体连通性好,构成该油田最为重要的有利储集层。但砂体内部具有强烈的非均质性特征,据此进一步划分为坝中、坝缘及坝间沉积微相类型,其中,坝中微相以细-中砂岩为主,孔隙类型包括原生粒间孔、铸模孔和次生加大孔,孔、渗性较高,储层物性良好;坝缘微相以细砂岩和粉砂质砂岩为主,孔隙多被胶结物充填,储层物性中等;坝间微相以粉砂岩或粉砂质泥岩为主,孔隙类型以微孔隙为主,储集性能差。不同微相类型的砂岩相互叠置形成砂坝复合体,加剧了储层平面非均质性和层间非均质性。
[Abstract]:Based on the core, logging, seismic and regional geological background, comprehensive mineral petrology, sedimentary structure, logging facies and seismic facies of equal sign, Pakistan India River Basin K oil Cretaceous sandstone group along the open coast typical sand dam sedimentary facies, the reservoir facies marks include: with high maturity quartz sandstone, containing glauconite, marine carbonate glauconite indicator minerals, were scattered like distribution; development of parallel - low angle cross bedding or massive bedding and tidal bedding type, rock see rich biological scale, with a large number of biological burrows and strong bioturbation phenomenon; logging facies is a funnel type or box type and to reverse cycle; seismic facies with parallel sub parallel sheet; shelf storm deposits associated with coastal sand dam. Analysis shows that the plane multi banded distribution parallel to the coast line, along the longitudinal period Sand dam stacked sand body connectivity, constitute the most important reservoir for the oil reservoir. But the sand body has strong heterogeneity, which is further divided into the dam, dam edge and dam microfacies, dam microfacies in sandstone. And the pore types include intergranular pore, moldic pore and secondary pore permeability increase, pore, high reservoir; dam edge facies in fine sandstone and silty sandstone, pore by cementation, reservoir medium; between dam microfacies in the siltstone or powder the sandy mudstone, pore type in micro pores, poor performance of reservoir. Different microfacies sandstone superimposed formation sand dam complex, exacerbated the reservoir plane heterogeneity and interlayer heterogeneity.

【作者单位】：长江大学油气资源与勘探技术教育部重点实验室;中石油东方地球物理公司研究院油气评价所;
【基金】：陕西省教育厅科研计划项目(2013JK0844)
【分类号】：P618.13
【正文快照】： 2.中石油东方地球物理公司研究院油气评价所,河北涿州072750)开阔海岸相是指无障壁岛遮挡、海水循环良好的开阔海岸地带,其砂体常年受到潮水的反复淘洗,分选好,粒度适中,以中细砂岩为主,极易形成优质的储集体[1-6]。沿岸砂坝位于破浪带,处于波浪影响海底的高能带,通常宽数百-

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